Creating a Singleton in TypeScript | by Steve Hankin | Aug, 2022

A classless object approach to a well-known pattern — from JavaScript to TypeScript Photo by Shubham Dhage on Unsplash Often the design patterns are translated to JavaScript using the ES6 Class declaration, perhaps for a couple of reasons: Popular definitions¹ of design patterns use the class keyword Java proliferates, and it is trivial to transfer … Read more

Differences: Static Class vs. Singleton Patterns

When developing apps with C# in the .NET framework, you have a choice between two single, shared class instances. Whether you decide to use a static keyword or a singleton design pattern depends on several factors, which are outlined in the article below. Key Differences Between Static Classes and Singleton Patterns Put simply, a singleton … Read more

Creating a singleton in Python

Use a Metaclass I would recommend Method #2but you’re better off using a metaclass than a base class. Here is a sample implementation: class Singleton(type): _instances = {} def __call__(cls, *args, **kwargs): if cls not in cls._instances: cls._instances[cls] = super(Singleton, cls).__call__(*args, **kwargs) return cls._instances[cls] class Logger(object): __metaclass__ = Singleton Or in Python3 class Logger(metaclass=Singleton): pass … Read more

Visualizing Thread-Safe Singletons in Java

Working in Java, we seldom have to create our handwritten singletons, for the existing frameworks like Spring creates these objects for us and maintains them. In enterprise applications, we get into framework disposal and let them create the singletons. But it is interesting to know the singleton pattern and visualize the famous pattern in a … Read more